[atomate2] parsing of f orbitals in dos

It looks like a call the obtain the complete DOS:

Fails for f-orbitals since there is a call to get_element_spd_dos in get_band_filling which I think is incompatible with f-orbitals.

Thanks for raising this. @arosen provided a fix which is now available in the master branch on GitHub.

Thanks @alex and @arosen